packages/frontend/src/pages/chat/room.vue

@@ -147,10 +147,17 @@ useMutationObserver(timelineEl, {
 });
 
 function normalizeMessage(message: Misskey.entities.ChatMessageLite | Misskey.entities.ChatMessage): NormalizedChatMessage {
+	const reactions = [...message.reactions];
+	for (const record of reactions) {
+		if (room.value == null && record.user == null) { // 1on1の時はuserは省略される
+			record.user = message.fromUserId === $i.id ? user.value : $i;
+		}
+	}
+
 	return {
 		...message,
 		fromUser: message.fromUser ?? (message.fromUserId === $i.id ? $i : user.value!),
-		reactions: message.reactions.map(record => ({
+		reactions: reactions.map(record => ({
 			...record,
 			user: record.user ?? (message.fromUserId === $i.id ? user.value! : $i),
 		})),